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Castelló de la Plana vs Terrassa

Tree cover and air quality for both, measured the same way: Sentinel-2 imagery at 10 m detail over a 2 km radius from each city centre, and the live US EPA air quality index. Same radius and same index, so the two numbers compare directly.

Terrassa has more tree cover — 13.8% against 11.0%.

Castelló de la Plana has cleaner air right now — AQI 50 against 63.

Tree cover gap
2.8 points
Terrassa is ahead.
Air quality gap
13 AQI
Castelló de la Plana is cleaner.
Trees between them
8.8K
Terrassa has more standing.
Castelló de la Plana

Spain

Terrassa

Spain

Tree cover

Share of the 2 km radius under canopy.

11.0%

13.8%

Air quality index

US EPA index, live, with its band. Lower is better.

50 · Good

63 · Moderate

Trees standing

Estimated from the measured canopy area.

34.6K

43.3K

Trees still needed

To reach the same canopy target. Fewer is better.

59.7K

50.8K

CO₂ absorbed each year

By the trees already standing.

760K kg

953K kg

The full Castelló de la Plana report34,558 trees, measured Sentinel-2 L2A (ESA Copernicus) via Earth SearchThe full Terrassa report43,311 trees, measured Sentinel-2 L2A (ESA Copernicus) via Earth Search

Air quality in detail

What each city is breathing

Concentrations in µg/m³, measured at the same moment as the index above. Lower is better in every row. Both are read from nearby ground stations.

PM2.5

Fine particles, the pollutant that usually sets the index.

12 µg/m³

17.8 µg/m³

PM10

Coarser particles — dust, pollen, road grit.

7 µg/m³

19 µg/m³

Nitrogen dioxide

Mostly traffic and combustion.

38 µg/m³

28.5 µg/m³

The last week, day by day

A single reading can catch a city on a bad afternoon. The week says whether it was the weather or the place.

Castelló de la PlanaTerrassa· daily US EPA index, last 7 days
0255022 Sept25 Sept28 Sept
Daily air quality index for Castelló de la Plana and Terrassa
DayCastelló de la PlanaTerrassa
22 Sept3450
23 Sept4049
24 Sept4448
25 Sept4547
26 Sept4649
27 Sept4048
28 Sept3739

Reading these numbers

What is actually being measured

Tree cover

The share of ground under canopy inside a 2 km radius of each city centre, read from Sentinel-2 satellite imagery at 10 m detail. It is a measurement of that circle, not of the whole municipality — which is exactly what makes the two comparable, since city boundaries are drawn to wildly different rules around the world. Terrassa leads here at 13.8%.

Air quality index

The live US EPA index, computed from current pollutant concentrations — ground stations where a city has them nearby, and a model everywhere else. It moves hour to hour, so this is a snapshot rather than a verdict on either place: Castelló de la Plana reads 50 (good) and Terrassa reads 63 (moderate) right now.

Frequently asked

Castelló de la Plana and Terrassa, answered

Which has more trees, Castelló de la Plana or Terrassa?

Terrassa, with roughly 43,311 trees inside its 2 km radius against 34,558. Tree cover tells a slightly different story from raw count: Terrassa has the denser canopy at 13.8%.

Which has better air quality, Castelló de la Plana or Terrassa?

Castelló de la Plana right now, at AQI 50 against 63 — a gap of 13 points. This is a live reading rather than an annual average, so it can reverse within a day.

How many more trees does each city need?

Castelló de la Plana needs about 59,690 more to reach its canopy target, and Terrassa about 50,843. The target is the same share of ground for both, so the figures are directly comparable.

Are these two measured the same way?

Yes — that is the point of the page. Identical radius, identical satellite source at 10 m detail, and the same US EPA index for air. Nothing here is adjusted for population, city limits or climate, so the numbers describe the same-sized circle of ground in each place.

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